Samsung LW20M21cpd I am looking for the number of the power supply regulator I/C. It is marked as IC101 on the circuit board. it is 6 legged devise but has blown a hole in the casing so the number has disappeared

when I turn off and then Turn on after 10 minutes the TV notwork(by using remote or touch button). I try to disconnect power supply andthen reconnect and waiting a couple of minutes and turn on but no work (nosound and black desktop) .I repeat this procedure many times so some timework and sometimes not work. please help me to solve this problem

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Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
BN44-00341B - will be the number of power supply board used with this TV. Check it. If so, visit the site linked here to see its circuit diagram. Try to follow it, and do a repair work, or replace it.
Good luck

Fault with the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Fault in the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
There are circuit diagrams [schematics] to some model power supply boards to Samsung. BN***** Series SMPS. Check it, and try to repair if you're sound in electronics, and has previous work experience in repairing the SMPS power supplies.

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and precious time.

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit.Contact any service technician.If you wish to get some details; check the site linked here.Surf the site with patience.Pull up older posts. Abnormal DC output from the main power supply board [High / Low]; can cause this fault.http://electronicshelponline.blogspot.com/It will be best to replace the power supply regulator board as card basis.

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/It will be best to replace the power supply regulator board as card basis.

When you change the caps check the polarity.Check the diodes,and the regulators, Resistors,Fuses looks like a transitorstwo legs no 3 legs like the transistors get a voltmeter and read the voltage if are there, check the screen voltage.

HelloA defective power supply switching regulator board can cause this fault. Check your TVs power regulator board [mains] for any leaky or bulged capacitors in it. If there is some, the voltage regulation will be poor and all other circuit boards won't get sufficient voltage to work on. I hereby attaches two pictures. On the first one you can see a good capcitor with flat top and the same type of bulged [damaged] one. On the second picture, you can see two bulged capacitors [arrow marked] and goond ones by its side. This is the picture of the mains power switching regulator board of your Samsung Tv. Check whether there is such damaged capacitors, I've described above. If there are, repalce them with same type in capacitance. All of its details will be printed on its boady. You can buy them from any electronic spare part selling shops at your town. If this does not help you, replace the board as card basis. There is no other repair can be done with these type of power supplies, other than replacing damaged capacitors if any. OK.